Lead-headed nail



June 15 1926. 1,589,047

w. M. BROOKS LEAD HEADED NAIL Filed Nov. 22, 1924 INVENTOR ATIRRNEYPatented J n. 15,1926.

WINFRED M. BROOKS, OF WEST ORANGE, N EW JERSEY.

LEAD-BEADED NAIL.

Application filed November 22, 1924. Serial No. 751,489.

- This illVeIltlOIl relates generally to lead hcadednails used forroofing or slmilar purposes and has forits main object andfeaturereduction in the amount of lead used 5 in their productionwithout impairing their sealing qualities.

In the accompanying drawings the invention is disclosed in form in whichFig. 1 is a view in elevation. of a nail embodying the invention.

Fig. 2 is a view similar to Fig. l with the body of lead [in section.

Fig. 3 is a View similar to Fig. 2 but, after 15 the body of lead hasbeen reduced by-hammer blows. v Nails of this character are driven in byhammer blows, the body of lead surrounding the head of the nail beingflattened in the process. It will be understood that the body of leadforms a sealing disk around the head of the nail. Owing to thedifliculty of imbedding the head of the nail in a body .of lead, adifliculty resulting from the chilling effect which the head of the nailhas upon the molten lead, it has been the custom'to form the outersurface of the body of lead with a pronounced; convexsurface to therebyassure free flow of the molten metal 0 around and beneath the head ofthe nail. This form of the body of lead results in the ,use of'anunnecessary amount of lead for sealing purposes and consequentlyincreases v the cost of production. 4

' I find that the amount of lead used may he'diminished withoutimpairing the sealing qualities of the lead disk and without interferingwith the free flow of metal when pouring the molten lead around the headof the nail.

1 indicates a nail having a head 2. Around this head is applied a bodyof lead 3 consisting of a main body 4 and a dome 5.

a concrete and preferred other and meetin vmoltenmetal and to form,

On its outer side the main body is formed with two taper surfaces 6 and7 oneabove 45. the other, these. surfaces meeting substantially in theplane of the head of the nail and lower surface 7 tapering moreabruptly, with respect to the longitudinal center line of the nail, thanupper surface 6. The result is that when pouring the molten lead intothe mold, the metal will flow outwardly sufficiently .far away from thehead of the nail as not to be unduly chilled and will then take a moreabrupt drop, with respectto the 55 longitudinal center line of the nail,as the metal passes beneath the head of the nail. When the body of leadis subjected to hammer blows substantially the formation indicated inFig. 3 is obtained. As there shown the outer circumference E? of thesealing disk is of'less thickness than the main portion 9 thereof butthisdoes not interfere with the sealing qualities of the disk since thecircumference of said disk is substantially equal to that of the diskproduced by the old method. The amount of metal saved is indicated indotted lines at 10 in Fig. 3. j I claim:

A nail the head of which is imbedded in a body of lead, said body oflead having on' its outside two taper surfaces, one above thesubstantially in the plane of the head of t e nail, the lower surfacetaperin more abruptly, with respect to the longitu inal center line ofthe nail, than the upper one, to thereby allow free flow of the J whensubjected to blows, a sealing disk the outer circumference of which isof less thickness than the main portion thereof.

Signed at 98 Park Place,.in the county of- New York and State of NewYork, this 20th day of November, 1924.

WINFRED M. BROOKS.

